单项选择题

The main idea of the first paragraph is ______.

A．life on land probably began about 4, 300 years ago
B．the first animal on land came from oceans
C．there wouldn't be animals without plants
D．plants are the only form of life that is able to get and store energy
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单项选择题
The first trees were like modern trees in most ways except that ______.
A．they do not have branches
B．they do not have flowers
C．they do not have seeds
D．they do not need sunlight
单项选择题
According to the passage, the higher a tree grows, ______.
A．the stronger it becomes
B．the more sunlight it will get
C．the thinner it will be
D．the thicker it will be
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